A) an imaginary straight line joining two opposite points at the ends
B) an imaginary straight line joining the midpoint at one end and the midpoint at the opposite end
C) an flat area that runs through any axis
D) an animal having its body parts arranged in such a manner to exhibit summery
Correct Answer: B
Solution :
Principal axis is an imaginary straight line joining the mid-point at one end and the mid-point at the opposite end.
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